Neither Black nor White Canary use the Canary Cry nowadays as they once did, but they’re both formidable fighters without it, and Laurel may be fighting a losing battle even with her meta powers.
Sara didn’t leave her team to get into trouble on the Waverider to be beaten by the doppelganger of her sister!
Although the lighting in the footage makes it difficult to see many details, it’s enough to show that Laurel will attack the two Canaries, with Sara and Dinah diving out of the way.